Body Fat Calculator — Calculate Body Fat Percentage

What is a Body Fat — Calculate Body Fat Percentage?

Body fat percentage measures the proportion of your total body weight that is pure fat tissue. Unlike BMI (Body Mass Index), which only uses height and weight, body fat percentage distinguishes between fat mass and lean mass (muscle, bone, organs, water). This makes it a significantly more meaningful measure of fitness and health — an athlete and an obese person can have the same BMI but vastly different body fat percentages. The US Navy Body Fat Formula is a widely used, validated method that estimates body fat from simple circumference measurements — no specialized equipment needed. For men: body fat is calculated from waist and neck circumference relative to height. For women: waist, hip, and neck circumference are used. While not as precise as DEXA scans or hydrostatic weighing, the US Navy method is accurate to within 3–4 percentage points for most people and is used by the United States military for fitness standards.

How to Use This Calculator

Select your gender. Enter your height in centimeters. Measure your waist at the narrowest point (above the navel, not at the belt line) and enter in cm. Measure your neck circumference just below the larynx (Adam's apple) and enter in cm. If female, measure your hips at the widest point and enter in cm. Click Calculate to see your body fat percentage, category (Essential/Athletic/Fitness/Average/Obese), and how you compare to healthy ranges.

💡 Pro Tips

• ✓Measure waist at the narrowest point — typically 1–2 inches above the navel, not at the belt.
• ✓Measure neck just below the larynx (Adam's apple), keeping the measuring tape level.
• ✓Measure hips at the widest point for females — usually at the level of the greater trochanters.
• ✓Take measurements in the morning before eating for the most consistent results.
• ✓Body fat naturally increases with age — the same category means different things at 25 vs 55.

Who Uses This Calculator?

Fitness enthusiasts tracking body composition changes during diet and exercise programs. Athletes monitoring body fat levels for performance optimization. People who have a "normal" BMI but feel they carry too much fat — body fat percentage can reveal what BMI misses. Gym trainers assessing client body composition at the start of a fitness program. Anyone wanting a more meaningful health metric than BMI alone.

Frequently Asked Questions

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